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5.1.6.1
Intelligent Platform Management Bus
The BMR-H8S provides dual buffered Intelligent Platform Management Bus (IPMB)
interfaces to the IPMB-0 bus on the PICMG 3.0 midplane. The I
H8S are connected the IPMB-A and IPMB-B through the LTC4300A I
2
I
C buffers allow the board I
fully seated and the I
5.1.6.2
Interface to the MPC
The BMR-H8S provides one serial payload interface to the MPC. This interface
supports hardware flow control, RTS (Request To Send) and CTS (Clear To Send).
5.1.6.3
IPMB-L Interface
The H8S provides a local IPMI interface wired to the AMC slot (IPMB-L). The AMC
IPMI interface is isolated through LTC4300A and controlled by H8 GPIO pins.
5.1.6.4
ATCA Hot-Swap Latch
Hot-swap is supported by monitoring of the hot-swap handle switch. The handle
switch goes directly to one of the GPIO pins on the H8S.
Payload Shutdown in Response to Hot-Swap
The hardware supports both non-graceful shutdown and graceful shutdown of
payload in response to a hot-swap event. In case of non-graceful shutdown,
firmware on the IPMC will disable the voltage rails before turning the blue LED on.
In case of graceful shutdown, IPMC writes to the SHUTDOWN_REQUEST bit in the
FPGA, which will cause an interrupt to be sent to the JBus-to-PCI-E bridge and the
MPC. When shutdown is complete, MPC signals this to IPMC through a status bit in
the FPGA.
5.1.6.5
LEDs
The Sun Netra CP3060 blade server supports three LEDs compliant with ATCA
specification:
Green LED – Healthy status
■
Amber LED – Fault condition
■
2
C to be isolated from the midplane until the board is
2
C bus on the midplane is idle.
Chapter 5
2
C channels on the
Hardware and Functional Descriptions
2
C buffers. The
5-19
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